public class Example2_2 {
  public static void main (String args[]){
    byte b=22;
    int n=129;
    float f=123456.6789f ;
    double d=123456789.123456789;
    System.out.println("b="+b);
    System.out.println("n="+n);
    System.out.println("f="+f);
    System.out.println("d="+d);
    b=(byte)n;  //导致精度损失
    f=(float)d; //导致精度损失
    System.out.println("b="+b);
    System.out.println("f="+f);
  }
}
